Question

Why do we use class III levers although they have mechanical advantage less than one?

• A. To obtain gain in speed
• B. To obtain loss in speed
• C. It acts as force multiplier
• D. It is used in raising a load

Answer 1

The correct option is A

To obtain gain in speed

Class III levers have mechanical advantage less than one, but by using them we get a gain in speed, i.e. a larger movement of the load is obtained by smaller movement of effort arm. For example, the blade of a knife moves longer by smaller movement of its handle.